Gujarat Technological UniversitySummer 2025 examination

GTU 3140915 Power Electronics Summer 2025 Question Paper & PDF

B.E. · Electrical Engineering · Semester 4 · Subject code 3140915
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Total
70 marks
To pass
23 marks (33%)
Duration
2.5 Hours 10:30 AM – 1:00 PM
Questions
5 with internal choice
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Q.1

14 Marks
(a)
3 marks
Draw and explain static characteristics of SCR.
(b)
4 marks
Describe bipolar PWM techniques in detail.
(c)
7 marks

Discuss three-phase semi converter connected to RL load in continuous conduction mode with circuit diagram and waveforms of output voltage/current for firing angle of

300

Q.2

14 Marks
(a)
3 marks
Discuss the need of freewheeling diode in phase-controlled rectifier.
(b)
4 marks
Discuss the requirement of Snubber circuit for reliable operation of an SCR.
(c)
7 marks

Derive output voltage equation for single phase full wave controlled rectifier with R load. Assume α is firing angle.

(c)
7 marks

Explain working of single phase to single phase step down cycloconverter with circuit diagram and waveforms for continuous and discontinuous load current.

Q.3

14 Marks
(a)
3 marks
SCR is not suitable for dc to ac converter for low power applications. Justify.
(b)
4 marks
Describe the SVPWM control technique in brief.
(c)
7 marks

Explain the working of three phase 120° mode voltage source inverter. Also draw the necessary waveforms and circuit diagrams.

(a)
3 marks
Classify different techniques for voltage control of inverter. Discuss any one in brief.
(b)
4 marks
Describe the SPWM control technique in detail.
(c)
7 marks

Explain the working of three phase 180° mode voltage source inverter. Also draw the necessary waveforms and circuit diagrams.

Q.4

14 Marks
(a)
3 marks
Discuss the operation of DC/DC Flyback converter.
(b)
4 marks

Discuss the effect of high switching frequency on harmonics spectrum in single phase full bridge voltage source inverter.

(c)
7 marks

Describe the dual converter operation with circulating current mode in case of single phase input supply. Also draw the voltage and current waveforms.

(a)
3 marks

Discuss single phase full wave AC voltage controller with circuit diagram and necessary waveforms.

(b)
4 marks
Discuss matrix converter with necessary circuit diagram.
(c)
7 marks

Explain integral cycle control of AC voltage controllers with necessary equations and waveforms.

Q.5

14 Marks
(a)
3 marks
Explain the basic structure of IGBT with schematic diagram.
(b)
4 marks
Discuss two transistor model of SCR.
(c)
7 marks
Explain multi-quadrant operation of DC-DC converter.
(a)
3 marks
Explain the basic structure of MOSFET with schematic diagram.
(b)
4 marks
List out the various SCR turn on methods. Discuss any one in detail.
(c)
7 marks
Explain the working of buck converter with necessary circuit diagrams and waveforms.

More Power Electronics papers

Questions repeat across sessions. Working through two or three papers shows you which topics GTU asks most.

Summer 202670 marks · 5 questions

Other Semester 4 subjects

BE Electrical

3140911
Economics for Engineers
3140912
Electromagnetic Fields
3140913
Electrical Machine- I
3140914
Power System- I

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About this paper

Official Gujarat Technological University (GTU) examination paper for Power Electronics (Summer 2025, B.E. · Electrical Engineering, Sem 4). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.

Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.

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